What is your crawl ratio?

[Stuntman Autoworks]

The "75% extra" theory is interesting. It doesn't really take into consideration how fast you'll be moving at that gear ratio at idle, only that there's enough oomph to keep you moving.

One long discussion I saw about this on pirate years ago had two main takeaways:

Tire size x pi = roughly what you want to shoot for for technical crawling... 60ft per min or 1ft per sec at idle-ish - so essentially ~100:1 or better with a manual, and half that with an auto because of the torque converter reduction.

Second thing was pretty obvious - engine power will determine how far off from that you can be and still be comfortable. Good torque off idle, you can be (numerically) lower, but if you are running a 1.3 in a sami, you need a bit more gear.

But a lot of those dudes in that discussion were out West and didn't deal with as much need for wheel speed. I think an auto is probably better out east because you can two foot it through the technical stuff and blast off when you need to, instead of having to shift your range box into high and grab 2nd.

I'm reminded of wheeling with a Marlin Crawler group out west. Duder would pull up on an obstacle, engine banging the rev limiter [baaaaa ba ba baaaaaa babada baaaaa ba ba baaaaa] tires baaaaarely fucking moving. "Hey Bill, are you in first, first low high low low?" "Nah, this is first second high low low low." "Oh, well you might want to kick it down a gear, this ledge is a little bigger than the last one" <ker chunk ker chunk> [baaaaa ba babadagagada ba baaaaaa babadagada baaaaa ba bababada ba baaaaa]

Fuuuuuuuuck.

I have a low crawl ratio but I rarely use it. I will use it in something real technical and I don't have to slip the clutch so it keeps it happy. But I have the option of the real low crawl and 2 other ranges for any type of terrain east or west coast. I like having the options sounds like the duders in shawns post didn't know how to use their options very well.

 

[shawn]

sounds like the duders in shawns post didn't know how to use their options very well.

The Man Himself was in the crawler convoy.

 

[Stuntman Autoworks]

The Man Himself was in the crawler convoy.

He has to wheel like that, 4cyl and an image to uphold lol.

 

[jeepinmatt]

Your numbers are off

I assume you are messing with me, but if not, I'm not surprised. I threw that together in less than 10 minutes.

 

[Mac5005]

 

[XJsavage]

I guess I like to keep it simple. One transfer case low, one trans low gear and one woopow. Anything extra is just way too many moving parts.

 

[Infamous1]

I guess I like to keep it simple. One transfer case low, one trans low gear and one woopow. Anything extra is just way too many moving parts.

This!

Besides I ain't smart enough to know when to pull which lever!! #4LOanGO!!

 

[Pacfanweb]

My Jeep build has 94.53:1 if the calculator is correct.
5.61 first gear
4:1 low range
4.11 gears
33's

 

[awheelterd]

The Man Himself was in the crawler convoy.

What a great way to twist an ankle and run yourself over.

 

[NickMaul]

AX15: 3.83
D300: 4.0
Axles: 4.56

69:1 [emoji1]

Like others have said low 1st gear is way too low. Probably only good for getting the front tires onto a ledge. After that you have to find 2nd or 3rd gear.

I would like to step up to 5.38s in the future to avoid having to ride around in low range.


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[XJsavage]

AX15: 3.83
D300: 4.0
Axles: 4.56

69:1 [emoji1]

Like others have said low 1st gear is way too low. Probably only good for getting the front tires onto a ledge. After that you have to find 2nd or 3rd gear.

I would like to step up to 5.38s in the future to avoid having to ride around in low range.


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My coworker has that same gearing in his 4.0 TJ. Ax15, 4:1 Rubi and 5.38s. He uses high range a lot even on 42" Red labels. That jeep in low range was a straight up hero out in Moab, the high range wasn't a slouch even bombing 90+ out across the sand dunes.
Motivation enough?

 

[NickMaul]

My coworker has that same gearing in his 4.0 TJ. Ax15, 4:1 Rubi and 5.38s. He uses high range a lot even on 42" Red labels. That jeep in low range was a straight up hero out in Moab, the high range wasn't a slouch even bombing 90+ out across the sand dunes.
Motivation enough?

Heeeawl yeah



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[pipeline]

tf727=2.45
d300=2.62
axle=5.13

crawl ratio-= 32.93:1

 

[paulevans76]

AX15: 3.83
D300: 4.0
Axles: 4.56

69:1 [emoji1]

Like others have said low 1st gear is way too low. Probably only good for getting the front tires onto a ledge. After that you have to find 2nd or 3rd gear.

I would like to step up to 5.38s in the future to avoid having to ride around in low range.

Man that I-6 torque must be nice. If I'm in 1st+low in some technical-ish section and have the bravado and audacity to try to turn or get too much in the way of crossed up without feathering the throttle a bit, my motor will stall.

 

[NickMaul]

Man that I-6 torque must be nice. If I'm in 1st+low in some technical-ish section and have the bravado and audacity to try to turn or get too much in the way of crossed up without feathering the throttle a bit, my motor will stall.

I’m still only on 35s so the motor can idle through pretty easily but I just barely keep my foot on the gas and it works pretty smooth without being cumbersome.


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